|Early Spring Conditions on Mount Rainier|
So what is a weather window and how does it relate to climbing Mount Rainier? Many new aspiring mountaineers have preconceived ideas of what this may encompass. When do I start? How many hours? What is my turn around time? All good thoughts but in the grand scheme these questions are small picture thinking. Weather windows at Mount Rainier should be measured in days not hours. The vast majority of people attempting a climb will take 3 days, and on the summit day from a high camp will take most of a day (8-14 hours) to complete. Big picture high pressure vs. low pressure weather patterns are important to pay attention to. High pressure weather systems (called ridges) will provide you with the best weather window for making a successful climb. Climbing during a low pressure weather systems (call troughs) can have its successes but can be limited and challenging in possibly hazardous conditions.
Make sure to check the synopsis paragraph on the Mount Rainier Recreational Forecast
It will give you best up to date big picture view of what is happening at Mount Rainier and the surrounding area.